rustdesk/flutter/lib/common/formatter/id_formatter.dart

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import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
class IDTextEditingController extends TextEditingController {
IDTextEditingController({String? text}) : super(text: text);
String get id => trimID(value.text);
set id(String newID) => text = formatID(newID);
}
class IDTextInputFormatter extends TextInputFormatter {
@override
TextEditingValue formatEditUpdate(
TextEditingValue oldValue, TextEditingValue newValue) {
if (newValue.text.isEmpty) {
return newValue.copyWith(text: '');
} else if (newValue.text.compareTo(oldValue.text) == 0) {
return newValue;
} else {
int selectionIndexFromTheRight =
newValue.text.length - newValue.selection.extentOffset;
String newID = formatID(newValue.text);
return TextEditingValue(
text: newID,
selection: TextSelection.collapsed(
offset: newID.length - selectionIndexFromTheRight,
),
);
}
}
}
String formatID(String id) {
String id2 = id.replaceAll(' ', '');
if (int.tryParse(id2) == null) return id;
String newID = '';
if (id2.length <= 3) {
newID = id2;
} else {
var n = id2.length;
var a = n % 3 != 0 ? n % 3 : 3;
newID = id2.substring(0, a);
for (var i = a; i < n; i += 3) {
newID += " ${id2.substring(i, i + 3)}";
}
}
return newID;
}
String trimID(String id) {
return id.replaceAll(' ', '');
}